Film-mask for cameras.



R. S. BURDETTE.

FILM MASK FOR CAMERAS.

APPLICATION FILED uov.s.19n.

Patented Oct. 8, 19186 I llIIlllI/IIIIIIIII/ 1'. i lull/11111111! INVENTOR Flam/d6: Bumlef/e ATTORNEYS To all w'hom it may concern:

Be it known that I, Brown S. Bumm'rm,

a; citizen of the United States, and a resident of San Antonio, in'thejoounty of Bexar'and State of Texas have invented a new and Improved Filmsk for Cameras, of which the following is a full, clear, and exact descri tion. a

I T 's invention relates to roll film cameras of that type containing attachments for adapting the camera for films of different sizes, such as the inventiou disclosed in the United States Letters Patent 1250,792 Defilm smaller than the one intende readily applied and efieotivelti'l cember--18, f1917;-and the invention has to moreparticularlywith an improved mask held in cooperative-relation with the film by" thecamera; back-so asto ermit a if for the camera to be used, therebeing masks of different sizes for the'diiferent size'films The invention hasfor its eneral vobjects to improve the construction 0% masks of this" character so as to be reliable and efiicient in use, com antively simple and inexpensive toman acturegandsod astobe held in pla ce- Among specific object of e invention is the provision-of a niaskin the 'form'of :a

appended thereto. In the accompanying drawing, which a portion broken away difl'erent forms of masks; and

rsp'ective view late having open f ind-pro v ided with novel means for-rea i ning it in proper position in theframe of and-for certain forms of camera the mask contains a flap which lies between the camera back and thefihn and serves to maintain the latter in the p'roperfocal plane.

With such objects inview, andfthers which will appear as the descripti pro-4 coeds, the invention comprises various; novel features of construction and arrangement of arts which will beset forth-with '-'cu-= iiuity in the following description an claims illustrates one embodiment of the inventionand wherein similar characters of reference indicate corresponding parts in all the views,

Figure 1 is a plan -v1ew of a camera with to show the mask in position;

Fig. 2 is a, rear view with a portion of the .camera back broken away;

3 and 4 are perspective views of two Fig. 5 is a fragmentary show1 the opposite face 0 the mask which is also ovoid of the filmho1ding flap.

Specification of Letters 1?. tent.

shown in a one end-of the exposure opening like the flap camera back.

Patented can s, 1918.

7 Application filed November 6, 1917. Serial Io. 200,545.

to the drawing,A designates the casing of an ordinary camera of any ype or form and in the casing is a convertible filmoldi windin mechanism such as that disclose :in'the tters Patent hereinbeifore referred to. The filz'n 1 passes over the usual rollers 2 and along the =camera hack 3, which latter has'a pee -opening 4;. The mask B comprises a platee meman e osure o mng' 6' and. around-the e of ifl i eplate-lite memlierlor body 5of the mask B is a marginal flange 7, which engages behinditheframe structure" 8 of the camera; thepo'rtion 9= 01? the mask fi tting'within the' exposure opening 10 of the camera; In this manner the-"mask' -is*prevented from moving 'either up or down, or

lateriliy, in its 'own plane, a'ndit islield by the camerwback 3agains't the frame structure 8, and, if desiredsprings may he aron the' mask,"as shown in 2,

w serve as pressure devices that; are undet tension whenthecameraha'ck is in osi I On the mask- Bmay be arrangeda "platetion, so the jmask is efl'ectively he in k like'flap 12 attached to'thebo'd'y of the'mask by a flexible strip .13. forming a'hingqand' this flap lies behind orfling-contactwlthj the rear face of the-niask wh'en 'thecam'era is g and it serves ftohold the film 1' in its roper focal plane; The flap may extend full le- 11 of the exposure opening 6, as-

ig. 3, or it mayextend short of 12' in Fig. 4 which arrangement is especially adapted for the autoiraphic camera. In certain types of camera flapf 12 or 12' has a peep opening 14 which registers with the poop opening 4 of the The fla may be varied in thicknem or shape to eep smaller in the'proper focal plane. The flap is essentially'a filler to be employed when the coxistruction'of the camera makes it necessary to k'ee the smaller film used in the proper focal plain e mask may be devoid of a flap, as shown in Fig. 5. The p {From the foregoing'description taken in* connection with the accompanying drawing,

stood by those skilled in. the artto whichthe 'nvention appertains, and'while I have de- J. scribed the principle of operation -together with the device which I new 001181 to he the advantages of the construction and vmethod of operation will be readily undermask in place. p

mask having an exposure opening to accommodate a film smaller than the maximum size film intended for the eamera,aud means cooperating with said mask to hold said smaller film in the proper focal plane.

2. The combination with a camera adapted to accommodatea film of a certain size, of a removable and interchangeable mask fitted in the back ofthe camera andhav-ing an exposure opening adapted to' accommodate a film of a smaller size, and means-cooperating withthe camera frame structureto h ld th 3. The combination acamera adapted to accommodate afilmo'f a ;certain size, .of 1 aremovable ;maskfitted in. the camera in jtheyfilm thereof-and having an front- 5 f exp n b:

opening, and a hinged flap on the,

m'ask and-lying behind thej fihn to hold the latter in its proper focal plane.-

4; The eombination ivith a namera having a frame structure providing an exposure openinglpf. a given size, means for supporting afilmhind theexposure opening,r.and a 'maskfittedin the saidoponin and having .llil exposure opening otsma or size than the first-mentioned opening.

'. 5. Theeomhination with a camera having I i being held-in =vera casing. v v. A

8. A camera including a casing, .a frame the structure, with a' mas a frame structure providing an exposure opemng of a ven size, means for supportmask fitted in the" said opening and having an exposure opening of smaller size than the first-mentioned openin and yielding means between the mask and ack of the camera.

' i. The combination witha'camera having a frame structure providing an exposure opening of a given s1ze,"means for supporting'a-film behind the exposure opening, a.

an exposure opening of smaller size than the first-mentioned opening, and an element on the mask for engaging behind the film,

to maintain the latter in he proper focal plane. v

7. A camera includinga casing, aframe.

'ing a film be ind the exposure opening, a. r

mask fitted in the said opening and having structure therein having an exposure olpenthe ing, and means for feeding a'film behin structure, with a mask comprising a plate- 4 like body disposed in the, said exposure open- 4 ing and having a peripheral fiange-e'ngagin the rear of the .frameistructurm-said mas place by the -back of; the camstructure therein .having an exposure opena film behind comprising a a plate-like body disposed in the-said exposure ing, and meansfor feedin opening and: having a peripheral flange. engaging therear of the frame; structure, said mask being held in place. by the back;

of thecamera casing, and a flap on the back of the mask for engagingbehind-the film to maintain the latter} in its proper fooal' plane;- 

